Se occurs as chemical element in the periodic table that has the symbol Se & atomic number 34. This occurs as toxic nonmetal that is chemically related to sulfur and tellurium. It occurs within many different forms however one of these occurs as stable gray metallike form that conducts electricity better within the light than in the dark & is utilized in photocells. This element is encountered around sulfide ores such as pyrite.

Applications

Atomic number 34 is an essential micronutrient in all known forms of life; it is the component of the unusual amino acid selenocysteine. Because of its photovoltaic & photoconductive properties, atomic number 34 is utilized extensively around electronics, like photograph cells, & solar cells. Atomic number 34 is as well extensively utilized around rectifiers.

Se is utilized to dislodge color from either glass, when it may counteract a green color ferric impurities impart. It too may be utilized to give the red color to glasses & enamels. Atomic number 34 is utilized to improve a abrasion trend lines within vulcanized rubbers. It as well finds application around photocopying.

A second have for atomic number 34 is the toning of pic, & is sold by many photographic manufacturers including Kodak and Fotospeed. Its artistic utilize is to intensify & extend a tonal range of black & white photographic images, & it can likewise exist as utilized for increasing a permanency of images.

History

Atomic number 34 (Greek σελήνη selene meaning "Moon") was discovered around 1817 by Jöns Jakob Berzelius who found a element associated by owning tellurium.

Incubation witharound se consumption was caused per development of recently utilizes, including applications in no-good combining, steel alloying, and atomic number 34 rectifiers. By 1970, se around rectifiers got largely been replaced by silicon, but its apply as a photoconductor around patently paper duplicator got be its leading application. In the period of a Eighties, the photoconductor application declined (although it wwhen however a big prevent-utilise) as extra & supplementary duplicator applying organic photoconductors were produced. Inside 1996, continuing the food & drug administration showed the direct correlation between se supplementation and cancer prevention in human being, however far flung straight application of this crucial sorting through would non add significantly to require owing to the little drugs mandatory. In a late 1990s, the have of se (normally using bismuth) as an additive to plumbing brasses to meet no-lead environmental standards became crucial.

Occurrence

Atomic number 34 is recognized through it's selenide in many sulfide ores, such as people of copper, silver, or lead. These are found as a byproduct of a processing one ores, from either the anode mud of copper refineries and a mud from either a lead chambers of sulfuric acid plants. These muds may be made by the total of means to obtain loose atomic number 34.

Isotopes

Atomic number 34 has at least Twenty-nine isotopes, of which 5 come stalls, & Half a dozen come nuclear isomers.

Precautions

When loose se is nonpoisonous, numbers of of its compounds come super toxic, & keep close at hand modes of action similar to it of arsenic. Hydrogen selenide and other compounds may be toxic. Plants grown inside selenium-rich soils, like locoweed, can drive good results in creature feeding on the plants.

Selenium and health

Se occurs as trace element in humans. These are utilized inside free radical elimination and more antioxidant enzymes, and likewise plays the role in the performance of the thyroid gland. Dietetic atomic number 34 comes from either cereals, meat, fish, & eggs. Brazil nuts are a particularly rich source of se.

Atomic number 34 deficiency within sound population is comparatively uncommon. It could occur around patients sustaining severely compromised intestinal function, or victims undergoing total parenteral nutrition. Instead, population depending on food that is sourced from either selenium-deficient soil come too at chance. A recommended dietary allowance for adults is 55 micrograms per day. Further than 400 micrograms by the day can lead to toxicity (selenosis).

In popular culture

Atomic number 34 from either a shampoo Head & Shoulders was used to kill the aliens in the film Evolution.